EP 3116885 A1 20170118 - PROCESS FOR TREATING BLACK LIQUOR
Title (en)
PROCESS FOR TREATING BLACK LIQUOR
Title (de)
VERFAHREN ZUR BEHANDLUNG VON SCHWARZLAUGE
Title (fr)
PROCÉDÉ DE TRAITEMENT DE LIQUEUR NOIRE
Publication
Application
Priority
- SE 1450282 A 20140312
- SE 1450832 A 20140703
- SE 2015050212 W 20150226
Abstract (en)
[origin: WO2015137861A1] The present invention relates to a method of membrane-filtrating a lignin containing composition in order to obtain a lignin fraction more suitable for further treatments.In particular it relates to treating a liquid lignin composition to obtain a lignin fraction having a desired molecular weight distribution by a membrane filtration. It comprises subjecting the liquid lignin composition to a first membrane filtration with a first filter cut-off adapted to remove species having a first molecular weight thereby providing a permeate with a molecular weight distribution defined by said cut-off. Then, the permeate from the first membrane filtration is; subjected to at least one further filtration step with a second filter cut-off, different from said first filter cut-off to provide a retentate (concentrate) with a molecular weight distribution defined by both the cut-off in the first filter the cut- off in said second filter. A dilution is performed on a desired lignin containing fraction at some point downstream of the first filtration unit. A lignin containing retentate (concentrate) is collected from the further ultrafiltration for further processing.
IPC 8 full level
B01D 61/14 (2006.01); C07G 1/00 (2011.01); C08H 7/00 (2011.01); C08H 8/00 (2010.01); C10L 1/02 (2006.01); D21C 11/00 (2006.01)
CPC (source: EP US)
B01D 61/027 (2013.01 - EP); B01D 61/145 (2013.01 - EP US); B01D 61/146 (2022.08 - EP US); B01D 61/58 (2013.01 - EP); C07G 1/00 (2013.01 - EP US); C08H 6/00 (2013.01 - EP US); C08L 97/005 (2013.01 - EP US); D21C 11/0007 (2013.01 - EP US); D21C 11/0042 (2013.01 - EP US); B01D 2311/252 (2022.08 - US); B01D 2311/2642 (2013.01 - EP); B01D 2315/12 (2013.01 - EP); B01D 2315/16 (2013.01 - EP); B01D 2317/022 (2013.01 - EP US); B01D 2317/025 (2013.01 - EP US); B01D 2317/08 (2013.01 - EP US)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
WO 2015137861 A1 20150917; EP 3116885 A1 20170118; EP 3116885 A4 20171101; US 2017015692 A1 20170119
DOCDB simple family (application)
SE 2015050212 W 20150226; EP 15760769 A 20150226; US 201515124870 A 20150226